package cn.univyz.framework.util;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileFilter;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * 类操作工具类
 *
 * @author  bfy
 * @since 1.0.0
 */
public final class ClassUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(ClassUtil.class);
    /**
     * 获取加载器
     */
    public static ClassLoader getClassLoader(){
        return Thread.currentThread().getContextClassLoader();
    }

    /**
     * 加载类
     */
    public static Class<?> loadClass(String className,boolean isInitialized){
        Class<?> cls;
            try {
                System.out.println("ClassUtil---loadClass---2:" + className);

                cls = Class.forName(className, isInitialized, getClassLoader());

                System.out.println("ClassUtil---loadClass---4:" + className);
            } catch (ClassNotFoundException e) {
                System.out.println("ClassUtil---loadClass---3:");
                LOGGER.error("load class failure" ,e);
                throw new RuntimeException(e);
            }
        return cls;
    }

    /**
     * 加载类（默认将初始化类）
     */
    public static Class<?> loadClass(String className){
        System.out.println("ClassUtil---loadClass---1:" + className);
        return loadClass(className,true);
    }
    /**
     * 获取指定包名下的所有类
     */
    public static Set<Class<?>> getClassSet(String packageName){
        Set<Class<?>> classesSet = new HashSet<Class<?>>();
        try {
            Enumeration<URL> urls = getClassLoader().getResources(packageName.replace(".","/"));
            while (urls.hasMoreElements()) {
                URL url = urls.nextElement();
                if (url != null){
                    String protocol = url.getProtocol();
                    if (protocol.equals("file")){
                        String packagePath = url.getPath().replaceAll("%20"," ");
                        addClass(classesSet,packagePath,packageName);
                    } else if (protocol.equals("jar")){
                        JarURLConnection jarURLConnection = (JarURLConnection) url.openConnection();
                        url.openConnection();
                        if (jarURLConnection != null){
                            JarFile jarFile = jarURLConnection.getJarFile();

                            if (jarFile !=null){
                                Enumeration<JarEntry> jarEntries = jarFile.entries();
                                while (jarEntries.hasMoreElements()){
                                    JarEntry jarEntry = jarEntries.nextElement();
                                    String jarEntryName = jarEntry.getName();
                                    if (jarEntryName.endsWith(".class")){
                                        String className = jarEntryName.substring(0,jarEntryName.lastIndexOf(".")).replaceAll("/", ".");
                                        doAddClass(classesSet, className);
                                    }
                                }
                            }
                        }
                    }
                }

            }

        }catch (Exception e){
            LOGGER.error("get class set failure",e);
            throw new RuntimeException(e);
        }
        return  classesSet;
    }


    private static void addClass(Set<Class<?>> classesSet, String packagePath, String packageName) {
        File[] files = new File(packagePath).listFiles(new FileFilter() {
            @Override
            public boolean accept(File file) {
                return (file.isFile() && file.getName().endsWith(".class")) || file.isDirectory();
            }
        });
        for (File file : files){
            String fileName = file.getName();
            if (file.isFile()){
                String className = fileName.substring(0, fileName.lastIndexOf("."));
                if (StringUtil.isNotEmpty(packageName)){
                    className = packageName + "." + className;
                }
                doAddClass(classesSet, className);
            } else {
                String subPackagePath = fileName;
                if (StringUtil.isNotEmpty(packagePath)){
                    subPackagePath = packagePath + "/" + subPackagePath;
                }
                String subPackageName = fileName;
                if (StringUtil.isNotEmpty(packageName)){
                    subPackageName = packageName + "." +subPackageName;
                }
                addClass(classesSet, subPackagePath, subPackageName);
            }
        }
    }


    private static void doAddClass(Set<Class<?>> classesSet, String className) {
        Class<?> cls = loadClass(className, false);
        classesSet.add(cls);
    }

}
